Amalgam for use in coating glass to form mirrors.



UNITED STATES PATENT OFFICE.

JOSEPHINE LAVAL, OF ALLEGHENY, PENNSYLVANIA.

AMALGAM FOR USE IN COATING GLASS TO FORM MIRRORS.

Specification of Letters Patent.

Patented July 7, 1908.

Application filed January 30, 1907, Serial No. 354,935. Renewed December 2, 1907. Serial No. 404,732.

To all whom it may concern:

Be it known that I, JOSEPHINE LAVAL, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Amalgams for Use in Coating Glass to Form Mirrors, of which the following is a specification.

This invention relates to amalgam forcoating lass in the production of mirrors. The ama gam is in the nature of an alloy, but when applied as hereinafter specified is ad- 'vantageous by reason of superiority in bril- Metallic antimony -five parts.

Bar lead "twenty parts. I Pure tin-in bars twenty. parts. Mercury- -fifteen parts.

The foregoing proportions may be varied to meet certain requirements, but for general usage the specific quantities mentioned have been found to be successful in arriving at the The amalgam,

result sought. a

In mixing the several metals above mentioned the metallic antimony is disposed in a crucible and subjected to a heat of about 850 F. and when melted the ure lead is added and the mass throroug lily stirred.

While the antimony and lead are in a heated and melted condition, the tin in pure form is then placed in the crucible, and when the whole is well fused it is allowed to cool to a lower temperature, say about 450 F. When the antimony, lead and tin have reached the I latter temperature, the mercury is added and thoroughly mixed with the other metals.

while in melted or liquid condition, is applied to the glass, and the method of mixing the several metals, as just explained, is effective in bringing the different ingredients into intimate association or relation and in maintaining permanency of the coating on the glass to overcome the deficiencies heretofore experienced in pursuing chemical processes or methods of coating or silvering.

The amalgam may be applied to the glass by any suitable means or machine, said amalgam being maintained in a heated or melted condition and fed or delivered to the glass to be covered in a fluid state. Owing to the nature of the amalgam, a quick dr ing action ensues with material advanta es om a commercial stand oint, in that t e glass may be covered and prepared for shipment in a comparatively short time and without i of amalgam,

liability of injuring the hd bl ens, suc ura e covering which rapidly bar and is 0 nature as to resist scratching and overcome,

other objections existingin the use of ordinar amalgam coverings such for instance,

peeing or scaling. Furthermore, the ordinary amalgam or silvering used on glass requires a backing, in many instances of some other material This extra coatin is unnecessary in applying the im rove amalgam embodying the features of t is invention.

There are at present many combinations of metals or alloys comprising some of the comonent parts of the amalgam embodying the eatures of this invention, but, so far as known, there is none that uses the same combination ofmetals; The present amalgam is more economical in its use and replaces the chemical or nitrate of silver process.

Havin thus described the invention, what is clairne ,is: 1

In test1m0ny whereof I have hereunto set my hand in presence of two subscribing wit- DEBSSGS.

JOSEPHINE; LAVALr. Witnesses: EUGENE W. LANGENEGER, Jr.,

MATHILDE PRUNEAU.

An amalgam for use in coating glass to 

